US1935168A - Heat regulator - Google Patents

Description

Nov. 14, 1933. l c. wANTz HEAT REGULATOR Filed Dec. 21. 1931 Patented Nev. 14, 1933 UNITED STATES HEAT REGULATORl Clarence Wantz, Milwaukee, Wis., assigner to Milwaukee Gas Specialty Company, Milwaukee, Wis., a corporation of Wisconsin Application December 21, 1931 Serial No. 582,282

This invention relates 4to heat regulators for ovens and the like, and has for itsobject the provision of a device in which all of the parts may be disposed within the confines of the Walls deg iining the oven or other space; and a device having an elongated thermostat extending substantially through the entire interior of the oven or other space from one wall to the opposite wall.

The permitted disposition within the confines of the Walls deilning ih'e ovenor other space enables the provision of an oven of improved appearance, and in addition all parts of the device are'well protected. The device may be calibrated accurately before installation, and no further adjustment need be necessary after the device is placed within the oven. The'controlling knob and associa/.ed dial of the device may be formed to conform or harmonize with the general contour or appearance of the oven or gas range.

The elongated thermal sensitive element extending through the interior of the oven or other space from one side to the opposite side provides a device having great selectivity of control, i. e.,

a device in which slight differences in temperature settings will produce temperature differences in true conformity therewith.

The device shown in the drawing comprises a control element for controlling the heating medium; a selecting device for hand control for the purpose oi selecting particular temperatures for particular purposes; and a thermal sensitive device for actuating the controlling device. The selecting device is mounted on the wall at one side of the oven, preferably with the control knob g5 and associated dial on the outside oi the oven,

and the control device is mounted upon the opposite side wall; the thermal sensitive device extending entirely through the ovenV space between 'i he opposite walls, with one end operatively associated with the selecting device and the opposite end operatively associated with the control device.

Other features and advantages of the present g invention will appear from the following detail and regulating device taken substantially on the l, line 2 2 of Figure l; and

`Figure 3 is a detail perspective view of my novel mounting ring.

descrip'ion taken inv connection with the accom- Referring to the drawing, the gas range is indicated generally by the reference numeral 5, and comprises the oven chamber 6, the control panel 7, and the oven top or grate burners 8. A suitable cover member 9 hinged at 9, as shown in dotted lines, provides a cover for the top burners 8, and also cooperates with the top of the oven chamber 6 to produce a table top type vof oven, although it is to be understood that my device may be adapted for installation upon any of the standard ovens which are'now in use, yor elsewhere as suitable or desired.

The ovenv 6 is provided with the usual bottom tray, and positioned below this tray of the oven is the usual type of oven burner, indicated in dotted lines at 1G. The burner 10 has the conduit or fuel supply pipe 1l leading from the control Valve 12 and connected to the burner 10. A suitable conduit 12 leads from the gas supply manifold 14 to the control valve l2. The gas is mixed with air in a conventional mixing tube at the burner 10.

A suitable gas cock 15 is positioned on the control panel 7 for controlling the ilow or" gas to the oven burner 10, vand corresponds in general to the gas cocks 15' for the open top or gratev burners 8. The gas. cock 15 has a tapped connection, not shown, with the gas supply manifold ifi, and may be provided with a suitable conduit member passing through control valve l2 and terminating in a Venturi tube 'which enters the mixing chamber for projecting the supply of gas into the mixing chamber, but this may vary widely'.

When gas cock 15'v is opened the gas passes from the manifold 14 through the control .valve 1'2 and associated conduit means to the mixing chamber of burner'lO. The valve 12 ds shown positioned between the outer oven wall 16 and an inner lining or spacing wall 17 which, with 95 the wall 16, forms a double; wall at one side o the oven. The space between the outer wall 16 and the liner 17 comprises an insulating chamber adapted to prevent rapid transmission of the heat within the oven to the outer wall 16.

The control valve 12 comprises the valve body 18 having an [inlet chamber 19 and an outlet chamber 20 formedtherein. A pair oi screws 2l are threaded into the valve body 18 and are countersunkin suitable openings formed in the 105 liner 17 for securing the valve body 18 rigidly to the wall member 17.

The valve body 18 has an integral partition wall 22 provided with an opening 22 formed therein for providing communication between 110 vsurrounding the opening 22. v'This recess is adapted to receive a valve closure member 24 of the mushroom type, and provides a seat for the valve member 24 around the opening 22'. The valve member 24 is adapted to control the quantity of combustible fuel flowing from the inlet chamber 19 through the opening 22' in the partition wall 22 to the outlet chamber 20. The inlet chamber 19 has communication by means of a suitable conduit connection 19' with the gas supply manifold` 14, this connection being controlled by the gas cock 15. The outlet chamber 20 communicates, by means of the conduit 11, with the oven burners 10. It is thus apparent that, upon opening of the gas cock 15, the gas is permitted to iiow through the conduit member to the inlet chamber 19 of the control device 12. From here the gas passes through the valve opening into the outlet chamber 20 and thence through the conduit 1l to the oven burner 10. The position of the valve member 24 with respect to the valve seat 23 determines the quantity of fuelflowing through the control device to the burner means l0.

4The control device 12 is provided with a cap member 25, this member being threaded for insertion in a corresponding openingv formed in one wall of the inlet chamber 19. The cap member 25 is provided. with a suitable recessed portion 26 adapted to receive the enlarged end of a helical spring member 27. The other end of the spring member 27 encircles a projecting knob formed on the valve member 24 and urges the valve member 24 yielding'ly to its seat.

A by-pass 27a is provided between the inlet chamber 19 and the outlet chamber 20 of the valve body 18, and has an adjusting screw 28 adapted to be threaded into the by-pass` for adjusting the effective area thereof. This by-pass permits gas to iiow from the inlet chamber 19 to the outlet chamber 20 and thence to the oven burner 10, even when the valve member 24 is seated against the valve seat 23. This by-pass is provided so that in case the gas cock 15 is left open inadvertently with the valve 24 closed, the gas will pass to the burner 10 where it will be ignited by the pilot flame and burner. 1n other words, the by-pass maintains the burner lighted whenever the gas cock i5 is open.

A pilot flame connection, shown diagrammatif cally in Figure l and indicated by the reference numeral 30, is provided for the purpose of at all times insuring ignition of any gas flowing to the oven burner. rllhis pilot flame connection comprises a threaded nipple member 29, suitably threaded into a tapped opening leading into the inlet chamber 19. This nipple member 29 is provided with an adjusting screw 3l which is adapted for adjusting the quantity of gas flowing through the nipple member 29 to the pilot name connection 30. The pilot flame connection 30 comprises a conduit having an outlet at its outer extremity positioned adjacent the oven burner 10 for maintaining a pilot flame at the burner.

The valve body 18 has a projecting boss 33 which projects through a suitable opening 34 formed in the liner 17 of the oven. A recess 36 in the outwardly projecting portion 33 of the valve body 18 is adapted' to receive the threaded end of a'tube or conduit member 37. The conduit v member 37 is held in position with respect to the projecting boss 33 by means of a lock nut 38 threaded upon the conduit and into engagenasales ment with the boss. The conduit 37 surrounds a stem member 39 which is engaged at one end with the valve member 24' for actuating the valve member.

The valve stem 39 has an enlarged portion 40 80 extending .transversely `of the oven and enclosed within the tube 37. The rd 4o .and the tube 31 form a rod and tube type 'of thermostat which is positioned transversely ofthe oven near the top thereof and which extends across the entire g5 width of the oven. The, rod and tube are formed of materials having different coeiiicients of thermal expansion,v the tube having a greater coefiicient of expansion than the rod, At its other extremity, this thermostat is secured to a suitable selecting means positioned on the oven Wall. This selecting means 41 comprises a housing member 42 positioned between the oven liner 17a and the outer oven wall 16a. The housing 42 has a cylindrical extending portion which projects through a suitable. opening in the liner 17a!1 and which is provided with a coaxial internally threaded portion 43 for receiving the threaded end of the tube 37. A lock nut 44 is provided for locking this end of the-tube within the housing 42.

At its other end, the internally threaded portion 43 of the housing 42 receives a spindle member 45, which is threaded therein and is adapted to move axially of the rod 40 when rotated. This 105 Vspindle member 45 has a reduced inner end 46 which is provided with an axial recess for receiv ing the projecting end of the rod 40. The rod 40 is mounted loosely within this recess or socket and is adapted to be moved axially by rotation u() of the spindle member 45. This axial movement. results in opening and closing of the valve member 24.

The spindle member 45 is provided with an enlarged flange portion 47 which is adapted to m5 provide a seat for a coaxial spring member 48. The other end of the spring member 48 abuts an annular washer, positioned about the spindle 45 and abutting the housing 42, for normally urging the spindle member outwardly from the 320 housing to seat the threads on the spindle against the threads in the housing in that direction thereby preventing gas leakage at all times.

Extending outwardly from the flange 47 is a stub portion 49 integral with the spindle member 25 45, this stub portion being provided with an internal axial recess threaded to receive a screw 50. Positioned about this stub portion 49 of the spindlev 45 are two irictional washers 51 and 52 which serve to engage the central part of a 130 suitable dial member 53 disposed therebetween for rotating the spindle 45 by rotation of the control knob 54. The control knob 54, which may be suitably knurled, is positioned outwardly of the washer 52 and is forced inwardly intom5 frictional engagement therewith by means of the screw 50, which clamps the knob 54 to the flange 47, with the washers and central part of the dial member clamped therebetween. The flange 47, M0 washer 51, dial member 53, washer 52, and the control knob 54 are forced inwardly for frictional engagementv therebetween by the screw 50 for insuring that upon rotation of the knob 54, the dial member 53 will rotate therewith and the 145 spindle member 45 will be moved axially.

The dial member 53 is provided with suitable temperature indications or markings corresponding to the range of temperatures desired within the oven, which is usually from 250 degrees to 500 degrees, although this may be varied asdesired.

The housing 42 has the outwardly extending ange portion 55 which is adapted to be engaged by grooves 56' formed in the inwardly extending portion v56 of a mounting ring or bezel 57,. This mounting bezel 57 is provided with a radially flanged portion 57 which engages the surface of the wall 16a.

This bezel 57 is provided in the panel or oven wall 16a for the purpose of permitting removal of the panel withoutinterfering with the heatv and is provided with spring fingers 59, struck' out from the ring member, which are adapted to engage the inner surface of the wall 16a, the spring fingers bearing resiliently against the wall.

A pair of tongue members 60, struck out of the ring member and extending outwardly therefrom, are adapted to be snapped into locking engagement with a cooperating pair of slots or apertures 61 formed in the inwardly extending portion 56 of the bezel 57. This provides a resilient, but positive, means for locking the ring member 58 in position with respect to the bezel 57, and affords a frictional' engagement for preventing rotation of the bezel with respect to the panel or wall 16a. f

The outwardly flanged portion 55 of the housing 42 has a stop pin 62 secured thereto for cooperating with a second stop pin 63 carried by the dial member 53 for limiting the rotation or' movement thereof.

In the operation of my control device, the control knob 54 is rotated to bring the desired temperature indication on the dial member 53 into register with the reference point or marking on the frame member 5'1. This results in axial movement of the spindle member 45 within the housing 42 which causes the spindle member to urge the rod 40 to the left, as viewed in Figure 2.

Movement of the rod 40 in this direction results in the valve stem 39 causing the valve member 24 to be forced off of its seat against the pressure of the spring member 27. The amount that the valve member 24 is removed from the seat 23 is dependent upon the degree of rotation imparted to the spindle member 45, this being determined by the temperature setting which is effected. After the selecting means has been initially rotated to the position corresponding to the temperature desired within the oven, the gas cock 15 is opened and gas iiows from the gas supply manifold 14 to the inlet chamber 19 of the valve body 18. From the inlet chamber the gas iiows through the valve opening to the outlet chamber 20 and thence through the conduit 11 to the oven burner 10.

If, for any reason, the temperature within the oven rises to a point greater than that desired, as indicated by the selecting means 41, the tube .37 and the rod 40 will begin to expand. Inasmuchas the control device 12 is iixedly secured tothe oven walllinei` 17 by means of the screws 21, the expansion of the tube 37 and -rod 40 will cause the housing 42 to be forced outwardly, resulting in the frame member 57 being forced away from the outer surface of the oven wall 16a against the pressure of the spring member 60.

rrise.

'As this occurs, the temperature within the oven diminishes, and the expansion of the member 37 is stopped, and the member begins to contract. This results in carrying the rod member 40 transversely through the tube in the other 4direction and tends to open the valve member 24 against the pressure of the spring 27. As a result the temperature within the oven will again tend to Thus the oven temperature is maintained at any selected point desired by means of this expansion and contraction of the rod and tube elements of the thermostat.

The device may be calibrated before installation, and no further adjustment is necessary. However, if for any reason it becomes necessary to change the quantity of gas flowing to the' pilot flame connection or to the burner maintenance connection, a pair of openings 65 and 66 are formed in the oven wall 16 and provide means for permitting access to the screws 31 and 28, respectively, for adjusting the screws within their-respective passages. These openings are normally hidden from view by the grate over the open. top burners 8.

The dial 53 may be adjusted with respect to the spindle 45 by loosening the screw 50 and turning the dial with respect to the selecting spindle. When the desired adjustment is obtained the parts are locked together by the screw 50. f

Other modiiications` and adaptations of the present invention are contemplated and I-do not intend to be limited to the exact details shown an outer wall member, a control device mounted between the inner and outer wall members of one of said walls, a selecting device at the opposite wall including a dial member, means-for adjusting the position of said dial member relative to said selecting device, and a thermal sensitive element extending through the oven from one wall to the other, said thermal sensitive element having operative association with the control dev-ice at one end and with the selecting device at its opposite end. a

2. In combination, a support having an opening, a control device, said control device including a valve member, a spring for seating said valve member, and a thermal sensitive device including a rod member cooperable with said valve member, a surrounding tubular member rigidly attached at one end to said control device and having sliding movement at its opposite end in the opening in said support, and resilient means walls, a Athermally sensitive member extending through said oven, and a control device positioned on the opposite wall of said oven.

4. In combination, an oven, a selecting means extending through one wall of said oven, a thermally responsive member extending through said oven, said member comprising a rod enclosed by a tube, a control device positioned on the opposite Wall of said oven, and mounting means for resiliently supporting said selecting means with respect to said oven wall.

5. In combination, an oven, a selecting means extending through one wall of said oven, a thermally responsive member extending through said oven, said member comprising a rod and an enveloping tube having diierent coeicients of thermal expansion, a control devicepositioned on the opposite wall of said oven, and mounting means for resiliently supporting said selecting means with respect to said oven wall. Y.

6. In combination, a thermally operated device comprising selecting means having a dial and associated spindle, a thermally responsive member having one end engaged by said spindle, a control device engaged by the other end of said thermally responsive member, and means engaging in said spindle providing for adjustment of said dial with respect-thereto.

7. In combinatiomin an oven, a thermally operated device comprising a selecting means having a dial and associated spindle resiliently .mounted in one side wall of said oven, a thermally responsive member engaging said spindle and coaxial therewith, and a control device engaged by said thermally responsive member positioned in the opposite side wall of said oven.

8. In combination, in an oven having opposite side Walls, a control device, a thermally sensitive member for actuating said control device extending laterally through said oven, said member being rigidly secured to said control device, a cylindrical internally threaded supporthaving a radially extending flange portion, means .carried by one of said side walls engaging said ilange portion for yieldingly supporting said support,VA

and means for securing said thermally sensitive member to said support.I

9. In combination, a control device, a valve in said control device, a rod and tube thermostat extending laterally from said control device, the rod of said thermostat having abutting engagement with said valve, a support at the other end of said thermostat comprising an internallyv threaded housing, `a selecting spindle threaded into said housing and having a recessed end re-` ceiving said rod, a dial member mounted on said spindle, and means for adjusting the position of said dial member withrrespect to said spindle.

10. In a heat regulator of the class described, a control device, a selecting device including an internally threaded housing having a radial transient ma@ te. was, its.

incarica ange, means cooperating with said iiange for supporting said housing in position, a spindle' threaded into said housing, a collar on said spindie, a dial member carried on said spindle, releasable means for frictionally' engaging said dial member against said collar to provid for rotation of said member upon rotation of said spindle, and thermally sensitive means extending between said control device and said selecting means including a rod and tube, said rod having abutting engagement at one end with said spindle and the other end with said control device.

11. In a heat regulatorI of the class described, a control device, a selecting device including a housing having a radial flange, said iiange having opposed peripheral indentations, means engaging in said indentations and enclosing said ange for supporting said housing in position and providing for sliding movement thereof, a selecting spindle threaded into said housing, and thermally sensitive means extending between said control deviceand said selecting means including an expansible rod having abutting engagement at one end with said spindle and at the other end with said control device.

12. In an oven having opposed side walls with' lining walls spaced inwardly therefrom, the combination of a control device secured between one of said oven walls and its corresponding lining wall, a selecting device secured between the opposite -oven wall and its corresponding lining wall, said selecting device including a spindle portion projecting outwardly of the oven wall and a housing receiving said ,spindle and having a radial flange, said flange having peripheral indentations, means engaging 'in said indentations for supporting said housing for lateral sliding movement, and thermally sensitive means extending between said lining walls and including an expansible rod having abutting engagement 115 at one end with said spindle and at the other end with said control device.

13. In combination, a selecting spindle, thermally sensitive means extending axially therelfrom, a control device having engagement with 129 the extending end of said thermally sensitive means, and means for resilientl'y supporting said spindle in position.

14. In combination, selecting means having an extending spindle, thermally sensitive means ex- 125 tending axially therefrom, control means having abutting engagement with the extending end of said thermally sensitive means, and means resiliently supporting said selecting means inpesition and providing for axial movement thereof. 130

CLARENCE wAN'rz.

@lli @@RREGTWN.

Ncvember M, 11933.

CLARENCE?. WAN'Z.

llt le hereby. certliied that. error appears in the printed speciiication ci the above numbered' patent recruiting 'correction as iollcws:

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